Locking device for the shipper mechanism of elevators.



PATENTEDAUG. 4, 1903.

R. THOMPSON. LOOKING DEVICE FOR THE SHIPPER MECHANISM OF ELEVATORSL APPLIOATION FILED APR. 22, 1903.

I0 MODEL.

agate- PATENT Fatenteol'Augu st 4',

OFFICE.

ROBERT THOMPSQN; OF HOLYOKE, MASSACHUSETTS.

. LOCKING DEVICE FOVRTHE S H ITPPERMECHANISIM OF ELEVATORS.

SPECIFICATION forming part of Letters Patent 1\l'o. 735,62 Q, dated August 4, 1903.

Application flIBd April 22, 1963-, Serial No. 153,780. (No model.)

To all whom it may concern.-

Be it known that 1, ROBERT THOMPSON, a citizen of the United States of America, and a resident of Holyoke, in the county of Hampden and State of Massachusetts, haveinvented certain'new and useful Improvements in Looking Devices'for the ShippenMechanism of Elevators, of which the following is a full, clear, and exact description.

This invention relates to safety devices for elevators, more particularly for freight-elevators in mills and factories.

The invention pertains to devices combined with the shipper bar or rod which changes the position of the belt or belts from the loose to the fixed pulley and which controls the action of the hoisting means for the elevator which are operative when the elevator is stopped at a floor and the belt is on the loose pulley, whereby the elevator will neither be raised nor lowered, for locking'the shipperbar, so that the conditions must be continued safe and so that the shipper-bar'may not be moved to establish conditions for raising or lowering the elevator except as it is intentionally released by reason of positively-applied force to'actuate the shipper-bar-lccking devices. 7

The invention consists in the combination or arrangement of devices and" in the'construction of certain of the parts, all substantially as hereinafter described, and set forth in the claims. I i

In the drawings, Figure 1 shows in sectional elevation an elevator, parts of floors having hoistways, the usual shipper mechanism, and the novel safety-lock for the latter. Fig. 2is an elevatiou'of parts comprised in the safety-lock mechanism as seen at right angles to the showing thereof in Fig. 1 and as seen looking beyond the line 2 2 in the direction of the arrow. 'Fig. 3 is a plan and horizontal sectional view as taken on the line 3 3, Fig. 2-.- Fig.4 is a somewhat-enlarged sectional view in detail as taken on the line 4 4., Fig. 1'. i

Similar characters of reference indicate corresponding parts in all of the views.

In the drawings, A represents the elevator, having the usual hoist-cable a, understood as having connection with a hoist -drum or crab, the hoist arrangements being controlled by the shipping devices of the usual character such as fixed pulley b, loose pulleys d d,'open and cross belts e e, shipperforks ff, carried on the horizontal shipperbar B, suitably supported and guided, the shipper-bar having its endwise movement imparted to it through means of the shipper-rod g, having connection 9 with rock-shaft 9 which is provided with the lever g linked to the shipper-bar.

' The shipper-bar B has within its upper-edge a notch 2', in which engages a dogj, which is carried at the extremity of a substantially horizontal lever is, which is intermediately pivoted at Z in a suitable bracket m and which lever at its end opposite from that at which the dog j is located has the vertically-elongated aperture n, in which engages for an advantageous degree of lost motion a rod 0, which in thepresent instance is shown as constituting, together with the vertical releaserod 0 (which has a degree of vertical reciprocation inthe'sam'e manner as the shipperrod,) the means for actuating to unlock the -shipper bar-locking device.

The aforementioned intermediately-pivoted lever It has its end at which the dog is carried balanced between the spiral springs t i at opposite sides thereof. The horizontalcross member to, provided with downwardly-extending ear-lugs 1%, through which extends the horizontal rod '0 and about an intermediate part of which rod 1; the locking-dog j, which has a round .hole through it, as shown in Figs. 4 and 3, en-

gages for a degree of sliding movement along the line of the rod, the spiral springs t t, interposed between the ear-lugs n n of the dog-carrying lever and the opposite faces of the dog, maintaining the latter normally balanced midway between the ends of the rod v. The dog is kept from turningbecause of the squared formation of itsupper end, which lies closely under the extremity of the carrying member u, as will be clearly perceived on reference to Fig. 4..

The .device is shown in the drawings as locked in the notch i of the shipper-bar B, the position of the bar such that the forks f f hold the belts on the loose pulleys at either side of the fixed pulley. Now in case it is desired to move the shipper -bar to place either of the belts on the fixed pulley, so that the elevator will be raised or lowered, the op erator will first be compelled to endwise move the release-rod 0 as may be done by pressing downwardly with the foot against one of the steps 0 thereof, whereupon the lever will have its one end depressed and its opposite end, carrying the dog, elevated against the reaction of the retracting-spring 10, (which is applied between an extension m of the bracket m and the upper edge of the arm of the lever 75, carrying the dog,) resulting in disconnecting the dog from its engagement with the shipper-bar, leaving the latter to be operated, through-means of the shipper-rod g or whatever connections therefor are employed, to move one or the other of the belts onto the fixed pulley b.

F indicates the location of a usual and wellknown form of friction device for the shipperbar, the same constituting no part of this invention and requiring no description herein.

In setting up the apparatus it will be found most practical to have the range of movement of the shipper-bar from either of its positions for holding the belts on the fixed pulley to those for holding the belts on theloose pulleys such that the notched portion of the bar will come to or move slightly by the normal plane of the locking-dogj, so that there will be the certainty of the locking engagement between the dog and the shipper-bar when the latter should be in the belt-unshipping position, and any inequality or excess of motion of the shipper-bar in being dropped to the unshipping position will be compensated for by the bodily-sliding movement of the dog relatively to its carrying part, and inasmuch as the vertical release-rod is usually intended to be spring-supported at the base of the building in the similar manner that the shipper-rods g for elevators are usually supported, with more or less liability of the spring for the release-rod to react upwardly somewhat unequally and also possibly after awhile to settle slightly, permitting the release-rod to sag. The provision of the vertically-elongated aperture 91, in which the releaserod branch or extension 0 engages, is a measure to practicability, manifest, insuring that any settling of the releaserod will be non-effective to accidentally disengage the dog from the shipper-bar, and, on the other hand, relieving the dog from undue downward pressure as might be imparted by the supporting stress ever present to the release-rod, it being manifest that the certainty of engagement of the dog is insured by the provision of the spring 10, and the tension of this spring may be rendered of the utmost fitness to its purpose by the adjustable tensioning-bolt at, to which the jam and locking nuts y are applied thereabout next above the bracket extension m The carrying-lever 70 may have its dog-releasing movement imparted thereto by any medium of connection appropriate therefor,

the vertical release-rod and its connections shown being operative, satisfactory, and available in most situations, and various departures and changes may be made in the details of the construction of this new device without departing from my actual invention.

I claim-- 1. In alocking device for the shipper mechanism for an elevator, the combination with the reciprocatory shipper-bar,having asocket, of a lever, a dog mounted on said lever and movable bodily therewith and having an independent slidingmovement relatively thereto in aline right angular to the plane ofswinging movement of the lever, springs in compression and reacting against the dog at opposite sides thereof, and means for swinging the lever for the purposes set forth.

2. In a device of the character described, the combination with the shipper-bar having a socket and the fixed bracket m, of the lever kintermediately pivotallyhunginthe bracket and having at one extremity the verticallyelongated aperture n, the release-rod 0 having the transverse extension-rod 0 engaging in said aperture, a dog carried at the opposite extremity of the lever and a spring reacting against the lever to force the dog toward the shipper-bar.

3. In a device of the character described, the combination with the shipper-bar having the notch or socket 11, of alever having at its extremity the separated depending ear-lugs 11?, a rod supported thereby, the dog having a hole therethrough and adapted for a sliding engagement on the rod, spiral springs encircling the rod and in compression at either side of, and between, the dog and the said ear-lugs, a spring for forcing the dog-carrying end of the lever toward the shipper-bar and means for swinging the lever.

4. In a device of the character described, in combination, the shipper-bar having the notch i in its upper edge and the bracket m having the bracket extension m of the lever 70 intermediately pivoted to the bracket, and having at its extremity the separated depending ear-lugs ta the rod v horizontally supported by, and between, said ear-lugs, the locking-dog, perforated and engaging about the rod, the spiral springs t '6 in compression at either side of the locking-dogs, the spiral spring w applied for reaction against the upper edge of the lover, a tensioning-bolt screw-engaging through the bracket extension and constituting an abutment for said spring and means for imparting a swinging movement to the lever substantially as and for the purposes set forth.

Signed by me at Springfield, Massachusetts, in presence of two subscribing witnesses.

ROBERT THOMPSON.

Witnesses:

WM. S. BELLoWs, A. V. LEAHY.

ICC 

